Cr30钢表面镍包WC增强铁基合金涂层的微观组织和耐磨耐蚀性能研究  

Microstructure,Wear and Corrosion Resistance Properties of Nickel-Coated WC Enhanced Iron-Based Alloy Coatings on Surface of Cr30 steel

作　　者：汤联生 连应华 林星 郭岩 TANG Liansheng;LIAN Yinghua;LIN Xing;GUO Yan(Fujian Huadian Kemen Power Generation Co.,Ltd.,Lianjiang 350512,China;Huadian Electric Power Research Institute Co.,Ltd.,Hangzhou 310030,China)

机构地区：[1]福建华电可门发电有限公司,福建连江350512 [2]华电电力科学研究院有限公司,浙江杭州310030

出　　处：《材料保护》2024年第8期80-87,共8页Materials Protection

基　　金：中国华电集团有限公司科技项目(CHDKJ22-02-103)资助。

摘　　要：为改善Cr30钢表面的耐冲蚀磨损性能以及耐硫酸、盐酸腐蚀性能,以铁合金粉和镍包WC颗粒的混合物为原料,采用激光熔覆技术在Cr30钢表面制备含镍包WC铁基合金涂层,研究了原料中镍包WC质量分数(10%~30%)对铁基合金涂层的显微组织、物相组成、显微硬度、耐冲蚀磨损性能、耐硫酸和盐酸腐蚀性能的影响。结果表明:不含镍包WC的铁基合金涂层物相为FeCr固溶体和Cr_(23)C_(6);含10%和20%镍包WC的铁基合金涂层物相为FeCr固溶体、Cr_(23)C_(6)和Fe3W3C;随着镍包WC含量增至30%,铁基合金涂层中析出了新的碳化物Fe_(6)W_(6)C,含30%镍包WC的铁基合金涂层物相为FeCr固溶体、Cr_(23)C_(6)、F_(e)3W_(3)C和Fe_(6)W_(6)C。随着镍包WC含量的增加,铁基合金涂层的显微硬度、耐冲蚀磨损和耐硫酸、盐酸腐蚀性能提高,当镍包WC质量分数为30%时,铁基合金涂层的组织致密、细化效果最明显,涂层的硬度最高,达到786 HV_(0.5);30%镍包WC的铁基合金涂层的耐冲蚀磨损、耐硫酸和盐酸腐蚀性能最佳。In order to improve the erosion and wear resistance of Cr30 steel surface and its corrosion resistance to sulfuric acid and hydrochloric acid,a nickel-coated WC iron-based alloy coating was prepared on the surface of Cr30 steel by laser cladding technology with using a mixture of ferroalloy powder and nickel-coated WC particles as raw materials.The effects of the mass fraction of nickel-coated WC(10%~30%)in the raw material on the microstructure,phase composition,microhardness,erosion and wear resistance,and sulfuric acid and hydrochloric acid corrosion resistance of the iron-based alloy coating were studied.Results showed that the phases of the iron-based alloy coating without nickel-coated WC were FeCr solid solution and Cr_(23)C_(6),while the phases of the iron-based alloy coating containing 10%and 20%nickel-coated WC were FeCr solid solution,Cr_(23)C_(6)and Fe3W3C.As the content of nickel-coated WC increased to 30%,new carbides Fe6W6C were precipitated in the iron-based alloy coating,and the phases of the iron-based alloy coating containing 30%nickel-coated WC were FeCr solid solution,Cr_(23)C_(6),F_(e)_(3)W_(3)C and Fe_(6)W_(6)C.Meanwhile,with the increase of the content of nickel coated WC,the microhardness,erosion wear resistance and sulfuric acid and hydrochloric acid corrosion resistance of iron-based alloy coating were improved.When the mass fraction of nickel coated WC was 30%,the microstructure of the iron-based alloy coating was dense and the refinement effect was most obvious,and the hardness of the coating was the highest,reaching 786 HV_(0.5).In general,the iron-based alloy coating with 30%nickel-clad WC possessed the best resistance to erosion wear,sulfuric acid and hydrochloric acid corrosion.

关 键 词：激光熔覆 镍包WC 铁基合金涂层 冲蚀磨损 酸性介质腐蚀 

分 类 号：TG174.44[金属学及工艺—金属表面处理]